Guarded cutter



W. FAIRCHILD Aug. 4, 1931.

GUARDED CUTTER Filed July 13. 1929 BY Ib1VENTOR fimvh 'ATTORNEYS ates.

Patented Aug. 4, 1931 c ntre a 51m: Es

wanmmvn Eamon-Inn, on ALBANY, NEW YORK, assienon'ro A.- r. w; PAPER 00.,or

- ALBANY; v new; YORK; A? OO'RBORATION: or NEW YORK GIIARDED CUTTERApplicationfiled' July 13,

My invention relatesparticularly to guarded cutters, that is to say,cutters orslitters which'are soguarded asto obviate accidents andwhichare applicable-to many differentt-ypes of'ma'chines but-particularlypaper cutting niachines:

The' objectof my invention is'to" provide! guarded cutterswhich are 'soconstructed as to; effectively guard the cutter and in such 'm-anner'asto-p'erma-nently and effectively gua-rdlitheoperatoraof-the same frominjury:

Another object i'ssto' =so construct the same asto prevent distortion ofthe'webof material} such as paper; on whichthecutter-oper- 7 Anotherobject is toprovide an effective drive for-the cutter withoutnecessarily applying a separate or direct driving mechanis'nrfor-thecutter:

Still another object" is to'mount' the-"cutter with a minimumnumberi ofparts and with as *l'wa cost of construction as possible.

A further object is'to retain the parts permanently' intheirintended-position without liability to'lose-their adjustment.

' Further objects of "my invention will" appear from the detailed:description of the" same hereinafter:

While my inventionis capable'ofembodL- ment iii-manydi if'erent" forms,for the pu-rpose 0t illustration-P have shown only certain forms of thesame in the accompanying drawings; in-which Figure l isa side elevationof a cutter a ed October 11, 1921. This comprises a transversesupporting shaft 1 having thereon an adjustable sleeve 2, held in placeby screw 3, acting as a supporting abutment for the out ter. Spaced awayfrom the sleeve 2 there is cala spring-supporting sleeved adapted to be1929.1 Serial No. 377,965.'

adjust-ed into its desired position by meansv of a screw 5. The sleeve 4has secured into theside thereofthe end 6 of'a'helical spring '1surroundingthe shaft 1, the other end of which8 extends into a liub 9for exerting a downward torsional pressure on a cutter supportinghousing '10 closed at the top and open at the-bottomand having'journalreceiving; slots 11 011 the two sides'thereof In the slots 11*thercis'supportedatransverse shaft 12 for rotatably carrying a circular ordisc-shaped cutter 13 havinga wedge-shapededge 14 for cutting andseparating theweb of material such as paper 15, on which the cutteroperates. Thewveb of paper 15'is supported upon a hardened steel ring16Wvl1ich is carried on he cutside-ofa roller 17 which is supported upona shaft" 18; It will'be-understood; of course, that if desired theshafts 1 and 18 may he of sufficient length to support a plupowerandthereby drives the cutter by contact therewith. Thus in the form ofinvention shown iu'Figs. 1 and Q'the shaft 12, and withit the cutter 13;are carried by the guard 21 and are locked in place against movementaxially of *shaft 'l by the guard screw 32- In th'e form of'inyinventionnslrown "in Fig ures S' -and l h'ave' provided acutter guardsupporting shaft-19 0f the sametype as the shaft 1 and adapted tobeintroduced into" cut ting-n'ra'chines;as, for example," paper cuttingmachines, as previously described'in connection with said" shaft 1'.Shaft" 19 passes through ahub 20' of a cutter guard 21 closed v at thetop, and open at the bottom, and which isprovidedwithqopposing slots 22for rotatably; receiving. a'transverse shaft 23 which extends entirely.across the machine and,may;- or-may;notibe'driven by any suitablegearing org-anyother' desired sou-roe of-power. T he saidshiaft- 28 isprovided with ar hub 24: de signed to be secured thereon inadjustedpositio nl by 'aos'crew 25, the same being provided with ai flange 26"to which a disc-shaped slit ting cutterTQT is secured: by. fouruscrews:28'

passing through flange 26 and through the cutter into a retaining ring29 located on the other side of the disc 27 and inside of the guard 21.The guard 21 has a large recess 34 to straddle hub 24 and in this formof device the guard is loose on shaft 19 and is held against playaxially on the shaft by locking the set crew 25. The outer edge of thediscshaped cutter passes downwardly into a slot 30 on a web-supportingroll 31 arranged for supporting a web of paper 32 thereon, the roll 31being carried by a shaft 38 which may be driven from. any suitablesource of power. It will be understood here again that the shafts 23 and38 may be so arranged as to provide a plurality of slitting discs 27with corresponding grooves 30 at different points along the shaftsaccordin to the number of places where the web of paper is desired to becut.

In the operation of my invention it will be understood, referring firsto Figures 1 and 2, that the web of paper 15 which is support-ed by theroll 17 will be continuously fed forwardly in the direction of the arrowand will be supported and cut by the wedgeshaped disc knife 3 which isrotated by con tact with the periphery of the hardened steel ring 16,the workman being at all times protected from injury due to the presenceof the guard 10, which not only encloses the discshaped cutter 3 butsupports the same for rotation therein. The construction is such,furthermore that once the parts have been adjusted by means of thescrews 3 and 5 and the sleeves 2 and 4- in whichthey are carried, thesaid parts will retain indefinitely their intended position and with thedesired amount of torsion from the spring 7, which exerts the desireddegree of pressure from the cutting disc 3 on to the ring 16. In thismanner danger to the workman due to the parts loosening their adjustmentor altering their position as a result of the continued operation of themachine is minimized.

In the form of my invention shown in Fig ures 3 and 4 the parts operatein a similar manner except that in this instance the slittcr 27 may,although it may not, be driven directly by means of the shaft 23 fromany suitable source of power and the weight of the slitter 27 with theguard 21 is suflicient to carry it well within the slot 30 of thewebsupporting roll 31 so as to effectively slit the Web of papercontinuously as it passes the cutter. In this instance the adjustment ofthe slitter 27 transversely of the machine is secured by the properadjustment of the hub 24 by means of the screw 25. Also in this instancereplacement of the slitter 27 may be effected by the removal of thescrews 28 and the attached parts for the insertion of a new slittingdisc. 7

In the above forms of my invention it will be understood also, as abovereferred to, that the construction is such as to contemplate the use ofa plurality of the cutting or slitting discs on the same shafts,corresponding arrangements being made from the web-supporting roll toprovide for the same.

While I have described my invention above in detail, I wish it to beunderstood that many changes may be made therein without departing fromthe spirit of the same.

I claim 1. In combination a disc-shaped rotary cutter, an integral guardenclosing the exposed portion thereof, a shaft on which the guard issupported, located beyond the periphery of the cutter, said shafthavinga spring thereon connected to the guard for exerting torsional forcethereon and adjustable sleeves secured to said shaft for determining therelative position of the spring and cutter.

2. In combination a rotary cutter, a shaft extending across said cutteroutside the periphery thereof, a guard to enclose the exposed portion ofsaid cutter carried by said shaft and movable longitudinally thereof, ashaftextending through the guard and carryin the cutter, and means atthe outside of said guard for fixedly positioning said guard and saidcutter longitudinally relative to said first shaft.

3. A structure as specified in claim 2 in which such guard positioningmeans is directly connected with said guard and fixes said guardrelative to said first shaft.

4. A structure as specified in claim 2 in which such guard positioningmeans is directly connected with said cutter and fixes said cutterrelative to said second shaft.

5. In combination a rotary cutter, a roll with which the cuttereo-operates, a shaft for the cutter, a guard for the cutter adapted tobear against said shaft at the sides of said cutter, and a pivotedmounting for said guard located beyond the periphery of the cutteradapted to cause the guard to press said cutter shaft towards said roll.

6. A structure as specified in claim 5 in which a spring is provided totension said guard and cutter shaft towards said roll.

In testimony that I claim the foregoing, I have hereunto set my handthis 1st day of July, 1929.

WILLIAM FAIRCI-IILD.

